#include <stdio.h>

int main() 
{
    int n = 0;
    int h = 0;
    int m = 0;
    m <= n * h;
    while (scanf("%d %d %d",&n,&h,&m) != EOF)
    {
        int s = m / h;
        if (m % h == 0)
        {
            printf("%d\n",n-s);
        }
        else 
        {
            printf("%d\n",n-s-1);
        }
    }
    return 0;
}